Pneumatic motor for piano-players.



J. LEISGH. PNEUMATIC MOTOR FOR PIANO PLAYERS.

APPLICATION FILED OCT.28, 1911.

Patented Mar. 9, 1915.

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J. LEISGH.

PNEUMATIC MOTOR FOB PIANO PLAYERS.

APPLICATION FILED 00128, 1911. 1,131,391. Patented Mar. 9,'

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JOSEPH LEISCI-I, OF TRYON, NORTH CAROLINA, ASSIGNOB TO THE JOHN CHURCH COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

PNEUMATIC MOTOR FOR PIANO-PLAYERS.

Application filed ()ctober 28, 1911.

To aZZ whom it may concern:

Be it known that I, JosnrI-I Lnison, a citizen of the United States, and a resident of Tryon, in the county of Polk and State of North Carolina, have invented certain new and useful Improvements in Pneumatic Mo tors for Piano-Players, of which the following is a full, clear, and exact descript on, reference being had to the accompanying drawings, forming part of this specification.

The object of my invention is to provide a construction for pneumatic low tension motors such as are employed in piano players for winding the music roll for the purpose of drawing the music sheet over the tracker openings in the tracker board of such players, in which provision is made for reversing the action of the motor to wind or rewind the music sheet, as the case may be, by means of a pneumatic under control of a suitable valve or push button.

The invention consists in the application of a slide valve so arranged and disposed that the valve may be operated through a pneumatic to change the motor ports from front to back and from back to front as may be desired.

In the drawings, Figure 1 is a front elevation of my improved pneumatic. Fig. 2 is a top or plan view of the same. Fig. 3 is a central vertical section, and Fig. at is a vertical sectional elevation of the part of the motor taken on the line 1, 1, of Fig.

The casing of the motor is indicated by the numeral 1, and the entire motor is of seXtuple construction, involving three operating chambers A, B, C, placed side by side, of similar construction, each provided with a movable wing 2, oivotally mounted at the bottom 3 of the double motor chamber, each of which is provided with the bellows folds 5, 6, so that three double-acting bellows motors are provided. Each of the wings 2 is connected by a suitable connecting bar 7, 8 and 9 with its respective crank 10, 11 and 1:2 on the crank shaft 13, which crank shaft is suitably mounted on supports 14., 1 1, at the upper end of the casing and is connected in any suitable way with the winding devices for winding and unwinding the music roll. Each of the three mo tors is connected by air suction communi- Specification of Letters Eatent.

Patented Mar. $1, 1915.,

Serial No. 657,387.

cated by passageways from the back and front of the'motor to the main vacuum chest of the player piano. The passageway from the back of one of the motors is indicated by 15, and the passageway from the front by 16. The passageway 15 has two branches, one opening out through the casing near the bottom at 17, and the other opening out through the casing near the top at 18. The front passage 16 opens out through the casing at 19, and a second passageway 20 from the front of the motor chamoer opening directly outward is also provided.

Slidable vertically in front of the casing is a slide plate 21, provided with ports 22, 23, 2st and 25, and this slide plate is coupled at its upper end with the lever 26, pivoted on shaft 27 mounted in the frame, and actuated by the connecting bar 28 connecting the short arm of the lever 26 with the pneumatic 29. In front of the slide plate 21 is located the slide valve 30, held in place by guides 31, 31, so that it can slide vertically, and this slide valve is provided with the recess 32, which communicates through the port 38 in the slide plate 21 with the common passageway or tube 3% which is connected with the vacuum chamber of the piano player, so that the recess 82 is always under suction. Each of these slide valves 30 is coupled by its respective connecting bar 35, 36 and 37 with its corresponding bar 7, 8 and 9, so that with the rotation of the crank shaft and the raising and lowering of the connecting bars 7, 8 and 9, the corresponding slide valves will be raised and lowered.

In the position shown in Fig. 3, the wing member of the motor A is in the middle of its stroke and moving toward the left, and the slide plate 21 is in such position that the passageway 18 and the rear passageway 15 are open into the recess 32 in the slide valve through the port 22 and. thus the left hand side of the motor is under suction, and the wing 2 is moving toward the left. The passage 16 from the other side of the motor chamber is exhausting into the outer air through the port 241- in the slide plate. As the wing moves toward the left, the crank shaft rotates, which lowers the connecting bar 7, and through the connecting bar 35 the slide valve 30 is lowered, which cuts off the port 22 from the vacuum chamber and allows it to open into the air at the same time that the port 24 is brought within the chamber 32, which places the passageway 16 under the suction of the vacuum, and the wing 2 reverses its movement. When the wing 2 has completed its stroke toward the right, the slide valve is shifted in the opposite direction to place the left hand side under suction. Thus the wing 2 is driven back and forth, rotating the crank shaft in the direction of the arrow, and rotating the winding roll for the music sheet in the proper direction. It will be understood that the two other motors are provided with similar passageways and sliding plates and slide valves and that thus the crank shaft is rotated by the three motors acting together. When it is desired to reverse the movement of the winding roll, the pneumatic 29 is opened up to the vacuum through the tube 38 which is controlled by any suitable valve, and this action draws down upon the connecting bar 28, raises the lever 26 at its inner end and shifts the slide plate 21 to close the ports 22 and 24, and opens the ports 23 and 25, bringing one into communication with the passageway 17 and the other into communication with the passageway 20. Under these circumstances, as hereinbefore described, the passageway 20 now becomes the suction side, and the passageways 15 and 17 the exhaust side. It will be thus understood that the movement of the-slide plate reverses the operation of the motor, and that by actuating the pneumatic 29, the motor can be instantly reversed.

Having thus described my invention,'what I claim as new and desire to secure by Letters Patent, is

1. In a pneumatic motor, comprising a double acting bellows, with a single bellowsboard therefor, having crank shaft connections, the combination with a double set of passageways to each side of the bellowsboard for subjecting the interior of the bellows to vacuum and atmosphere, of a slide valve to alternately open and close avacuum passageway to one side, and an atmosphere outlet to the other side of the double bellows, and a slide plate with ports therethrough adapted to register with one of the sets of passageways and to close the other of said sets, with means for shifting said slide plate to reverse the order of opening of the passageways by the slide valves.

2. In a pneumatic motor, comprising a series of double acting bellows with bellowsboard therefor, having crank shaft connections, the combination with a double set of passageways to each side of said bellowsboard for subjecting the interior of the bellows to vacuum and atmosphere, of slide valves to alternately open and close a vacuum passageway to one side. and an atmosphere outlet to the other of the double bellows, and interconnected slide plates with ports therethrough adapted to register with one of said sets of passageways and to close the other of said sets, with means for shifting said slide plates to reverse the order of opening of the passageways by the slide valves.

JOSEPH LEISGH. Attest:

FRANK H. KUNKEL, EARL W. GRIFFIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

.. Washington, .D. 0. 

